System and method to operate hvac system during voltage variation event

Abstract

A controller for a heating, ventilation, and/or air conditioning (HVAC) system is configured to detect an input voltage received as a power supply by the HVAC system, determine the input voltage exceeds a threshold value, and identify a voltage variation event based on determining that the input voltage exceeds the threshold value.

1 . A controller for a heating, ventilation, and/or air conditioning (HVAC) system, wherein the controller is configured to:
 detect an input voltage received as a power supply by the HVAC system; determine the input voltage exceeds a threshold value; and
 identify a voltage variation event based on determining that the input voltage exceeds the threshold value. 
   
     
     
         2 . The controller of  claim 1 , wherein the controller is configured to operate the HVAC system in a de-rated operating mode in response to identifying the voltage variation event. 
     
     
         3 . The controller of  claim 1 , wherein the controller is configured to determine that the input voltage exceeds the threshold value by confirming that the input voltage exceeds the threshold value for a threshold time period. 
     
     
         4 . The controller of  claim 3 , wherein the threshold value is a first threshold value, and the controller is configured to:
 determine that the input voltage exceeds a second threshold value, wherein the second threshold value is less than the first threshold value; and   determine a trend of the input voltage while the input voltage exceeds the second threshold value.   
     
     
         5 . The controller of  claim 4 , wherein the controller is configured to identify the voltage variation event in response to determining the trend is not toward the second threshold value for a trend time duration. 
     
     
         6 . The controller of  claim 5 , wherein the controller is configured to determine the trend of the input voltage by comparing the input voltage with a previously received input voltage. 
     
     
         7 . The controller of  claim 1 , wherein the threshold value is a first threshold value that is greater than a second threshold value, and the controller is configured to identify the voltage variation event based on determining that the input voltage is less than the second threshold value. 
     
     
         8 . The controller of  claim 1 , wherein the controller is configured to present a notification indicative of the voltage variation event in response to identifying the voltage variation event. 
     
     
         9 . The controller of  claim 8 , wherein the controller is configured to present the notification on a display of the HVAC system. 
     
     
         10 . A non-transitory, computer-readable medium comprising computer-executable instructions that, when executed by processing circuitry, are configured to cause the processing circuitry to:
 detect an input voltage received by a heating, ventilation, and/or air conditioning (HVAC) system;   compare the input voltage to a range of voltage values;   determine the input voltage is outside of the range of voltage values; and   identify a voltage variation event based on determining that the input voltage is outside of the range of voltage values.   
     
     
         11 . The non-transitory, computer-readable medium of  claim 10 , wherein the range of voltage values comprises an upper threshold voltage value and a lower threshold voltage value, and the instructions, when executed by the processing circuitry, are configured to cause the processing circuitry to identify the voltage variation event based on determining the input voltage is greater than the upper threshold voltage value or is less than the lower threshold voltage value. 
     
     
         12 . The non-transitory, computer-readable medium of  claim 11 , wherein the upper threshold voltage value and the lower threshold voltage value each deviates from an expected input voltage value by a difference value. 
     
     
         13 . The non-transitory, computer-readable medium of  claim 12 , wherein the range of voltage values is a first range of voltage values, the upper threshold voltage value is a first upper threshold voltage value, the lower threshold voltage value is a first lower threshold voltage value, the difference value is a first difference value, and the instructions, when executed by the processing circuitry, are configured to cause the processing circuitry to:
 compare the input voltage to a second range of voltage values, wherein the second range of voltage values comprises a second upper threshold voltage value and a second lower threshold voltage value, and the second upper threshold voltage value and the second lower threshold voltage value each deviates from the expected input voltage value by a second difference value that is greater than the first difference value;   identify the voltage variation event based on determining that the input voltage is outside of the first range of voltage values and within the second range of voltage values for a first threshold time period; and   identify the voltage variation event based on determining that the input voltage is outside of the second range of voltage values for a second threshold time period, wherein the second threshold time period is less than the first threshold time period.   
     
     
         14 . The non-transitory, computer-readable medium of  claim 10 , wherein the instructions, when executed by the processing circuitry, are configured to cause the processing circuitry to:
 determine a quantity of instances in which the voltage variation event has been identified over a time interval; and   operate the HVAC system in a lockout mode in response to determining the quantity of instances exceeds a threshold quantity.   
     
     
         15 . The non-transitory, computer-readable medium of  claim 14 , wherein the instructions, when executed by the processing circuitry, are configured to cause the processing circuitry to operate the HVAC system in a de-rated operating mode in response to determining the quantity of instances does not exceed the threshold quantity. 
     
     
         16 . The non-transitory, computer-readable medium of  claim 15 , wherein the instructions, when executed by the processing circuitry, are configured to cause the processing circuitry to:
 monitor subsequent input voltages received during operation in the de-rated operating mode;   determine whether the subsequent input voltages have been within the range of voltage values for a threshold time period; and   transition the HVAC system from the de-rated operating mode to a normal operating mode in response to determining that the subsequent input voltages have been within the range of voltage values for the threshold time period.   
     
     
         17 . A heating, ventilation, and/or air conditioning (HVAC) system, comprising: a compressor;
 a controller communicatively coupled to the compressor and comprising a tangible, non-transitory, computer-readable medium with computer-executable instructions that, when executed by a processing circuitry, are configured to cause the processing circuitry to:
 determine an input voltage value of an input voltage received as a power supply by the HVAC system; 
 identify a voltage variation event based on determining that the input voltage value is outside of a range of voltage values; and 
 operate the HVAC system based on identifying the voltage variation event. 
   
     
     
         18 . The HVAC system of  claim 17 , wherein the instructions, when executed by the processing circuitry, are configured to cause the processing circuitry to operate in a de-rated operating mode in response to identifying the voltage variation event. 
     
     
         19 . The HVAC system of  claim 18 , wherein the instructions, when executed by the processing circuitry, are configured to cause the processing circuitry to operate the compressor at a de-rated nominal capacity, to operate the compressor at a predetermined stage, to suspend operation of the HVAC system and restart the operation of the HVAC system after an anti-short cycle delay period, or any combination thereof, upon initialization of the de-rated operating mode. 
     
     
         20 . The HVAC system of  claim 17 , wherein the HVAC system is configured to electrically couple to a power source, and the HVAC system is configured to receive the input voltage from the power source.